Re: [eigen] matrix / scalar

[Andy Somogyi <andy.somogyi@xxxxxxxxx>]

Hi. I was just thinking that it might be nicer to do

MatrixXi mat = ...;

mat = 5;

instead of

mat.setConstant(5);

and

mat += 5;

is nicer than

mat.array() += 5;

The matrix interface supports scalar multiply but not scalar add/sub. To get scalar add/sub, I have to pull out the array class. 

No big deal either way, just thought it would be nicer syntax.

thanks

On Dec 4, 2010, at 1:05 AM, Thomas Capricelli wrote:

erm... have you read the tutorial ?

depending on the version of eigen you use:
http://eigen.tuxfamily.org/dox/TutorialCore.html

or

http://eigen.tuxfamily.org/dox-devel/TutorialArrayClass.html

greetings,
Thomas

--

Thomas Capricelli <orzel@xxxxxxxxxxxxxxx>

http://www.freehackers.org/thomas

On Saturday 04 December 2010 06:51:55 Andy Somogyi wrote:

> Hey Guys,

>

> what do you think about adding some operators to ease operating on a matrix with a scalar, i.e. what I'm thinking about is something like:

>

> MatrixXi mat = ...;

>

> // set all matrix values to scalar

> mat = 1;

>

> // add scalar to all matrix values

> mat = mat + 1; // or optionally

> mat += 1;

>

>